Power bank



FIG. 1 is a front, right, and top perspective view of a power bank,showing my design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are included for the purpose ofillustrating portions of the power bank that form no part of the claimeddesign.

CLAIM The ornamental design for a power bank, as shown and described.